Isolation, Phylogenetic Analysis and Anti-infective Activity Screening of Marine Sponge-Associated Actinomycetes

Marine Drugs - Tập 8 Số 3 - Trang 399-412
Usama Ramadan Abdelmohsen1,2,3, Sheila Marie Pimentel‐Elardo2,3, Amro Hanora4, Mona Radwan5, Soad H. Abou‐El‐Ela5, Safwat A. Ahmed6, Ute Hentschel2,3
1Department of Pharmacognosy, Faculty of Pharmacy, Minia University, Minia, Egypt
2Julius-von-Sachs-Institute for Biological Sciences, University of Würzburg, Julius-von-Sachs-Platz 3, 97082, Würzburg, Germany
3Research Center for Infectious Diseases, Josef-Schneider-Straße 2, 97080 Würzburg, Germany
4Department of Microbiology, Faculty of Pharmacy, Suez Canal University, Ismailia, Egypt
5Department of Biochemistry, Faculty of Pharmacy, Suez Canal University, Ismailia, Egypt
6Department of Pharmacognosy, Faculty of Pharmacy, Suez Canal University, Ismailia, Egypt

Tóm tắt

Terrestrial actinomycetes are noteworthy producers of a multitude of antibiotics, however the marine representatives are much less studied in this regard. In this study, 90 actinomycetes were isolated from 11 different species of marine sponges that had been collected from offshore Ras Mohamed (Egypt) and from Rovinj (Croatia). Phylogenetic characterization of the isolates based on 16S rRNA gene sequencing supported their assignment to 18 different actinomycete genera representing seven different suborders. Fourteen putatively novel species were identified based on sequence similarity values below 98.2% to other strains in the NCBI database. A putative new genus related to Rubrobacter was isolated on M1 agar that had been amended with sponge extract, thus highlighting the need for innovative cultivation protocols. Testing for anti-infective activities was performed against clinically relevant, Gram-positive (Enterococcus faecalis, Staphylococcus aureus) and Gram-negative (Escherichia coli, Pseudomonas aeruginosa) bacteria, fungi (Candida albicans) and human parasites (Leishmania major, Trypanosoma brucei). Bioactivities against these pathogens were documented for 10 actinomycete isolates. These results show a high diversity of actinomycetes associated with marine sponges as well as highlight their potential to produce anti-infective agents.

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